■ 1* FISH of CRATER LAKE NATIONAL PARK In Crater Lake; Records show that Crater Lake has been stocked with German brown trout, cutthroat trout, steelhead trout, rainbow trout, and silver salmon. Prior to the first recorded planting in 1888, the lake is believed to have been void of fish life. The last recorded stockings were of silver salmon in 1937 and rainbow in 191^1. The practice was discontinued when creel censuses began to show naturally reproducing populations of these two species. Subsequent investigation proved that the natural population of silver salmon was actually kokanee salmon. Since no kokanee were intentionally introduced, it is believed that one of the silver salmon plantings had actually consisted of kokanee fingerlings. Of these six species introduced, two remain today: . , 1. Kokanee salmon (Oncorhynchus nerka). This dwarf, landlocked form of Ihe Bockeye salmon is the most abundant and apparently best adapted species in the lake. The fish average from 9 "to I8 inches in length. 2. Rainbow trout (Salmo gairdneri). This fish is less abundant than the "^^-'-vanee but, due to its larger size,- from 12 to 2k inches, it is a favorite of the sport angler on Crater Lake. B. Park streams: Alth;>ugh only two cies of trout, brook and rainbow, have been planted in the strea Crater Lake National Park according to the stock- ing records, four foi have been collected and identified. 1. Brook trout (Salvelinus fontinalis), the most abundant and apparently the most firmly established. This trout has been collected or observed in almost every stream in the Park. 2. Dolly Varden trout (Salvelinus malma) appears to be well distributed in the lower. Sun Creek drainage. .It is assumed that this trout-^s-the* only native game species within the Park. They may have migrated up from the Wood River of the Klamath Watershed. None of them have been planted within the Park. 3. Rainbow trout (Salmo gairdneri). Although large numbers of these fish have been.planted-in..the.Parky it-api>ears that their n\mibers -are few and scattered in the park streama. They have been collected from Munson, Annie, Bybee, Sun, and Castle Creeks. t. Brown trout (Salmo trutta). One specimen was collected in Sand Creek above the falls, which appear to form an effective barrier to upstream migra- ,tion. -,It.-is .probable that-this-fish is a survival of an iinrecorded or- unauthorized planting in that stream..